<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Stage 2</title>
</head>
<body>

  <script src="module_a.js"></script>
  <script src="module_b.js"></script>
  <script>
    moduleA.vma = 1
    moduleA.fma()
    moduleB.vmb = 2
    moduleB.fmb()
  </script>
</body>
</html>